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S2 91
Designer: Graham & Schlageter  ·  Builder: S2 Yachts (Usa)  ·  First built: 1983
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About the S2 91

Designed by the respected team of Graham & Schlageter, this 30-foot cruiser emerged during the mid-1980s boom in affordable fiberglass sailboats. S2 Yachts built 127 hulls between 1983 and 1987, creating a modest but dedicated following among sailors seeking a capable coastal cruiser with solid construction values. The masthead sloop rig and moderate proportions reflect classic cruising priorities, with a fin keel and transom-hung rudder configuration that balances performance with practicality. At 7,850 pounds with 3,200 pounds of ballast, the boat carries enough weight for stability while maintaining reasonable trailer ability for those willing to tackle the logistics of a near-30-footer. With a sail area to displacement ratio of 19.91, this design falls squarely in cruising territory rather than racing-oriented performance. The moderate beam of 10.5 feet provides comfortable interior volume without sacrificing sailing characteristics, while the 5.5-foot draft offers good windward ability for coastal exploration. The comfort ratio of 20.02 suggests lively motion in seaways, making this better suited for day sailing and coastal cruising rather than extended offshore passages. The low capsize screening value of 2.12 indicates good initial stability, while the 15-horsepower auxiliary provides adequate power for maneuvering in tight quarters.

Market Price Estimate Beta
Small sample size. This estimate is based on fewer than 5 listings and may not be representative of the true market. Use with caution.
$14,000 – $14,000
typical asking price
Median $14,000  ·  1 listing used
All listings
$14,000 – $14,000 1
Rate a listing price
$
About this estimate
  • Prices are based on recent asking prices from public listings — not actual sale prices, which are typically lower.
  • Condition is not factored in. A well-maintained boat with new sails and engine can be worth significantly more than a project boat of the same model.
  • Location affects price. Boats in landlocked states or areas with fewer buyers often sell for less than those on the coast.
  • Year of manufacture is not filtered. Older examples of this model will generally be priced lower than newer ones.
  • Included equipment varies widely. A boat with a full suite of electronics, dodger, and new standing rigging may command a large premium.
  • Outliers are automatically excluded using statistical filtering to improve accuracy, but some bad data may remain.
Core Dimensions
LOA (Length Overall) 29.83 ft / 9.09 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 10.50 ft / 3.20 m
Max Draft 5.50 ft / 1.68 m
Displacement 7,850.00 lb / 3,561 kg
Ballast 3,200.00 lb / 1,451 kg
Sail Area (Reported) 490.00 ft² / 45.52 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Graham & Schlageter
Builder S2 Yachts (USA)
First Built 1983
Last Built 1987
Number Built 127
Associations S2 9.1 Meter
Related Sailboats ["S2 91 Sm" · "S2 91 Se" · "J30" · "Seidelmann 299" · "Pearson 30"]
Owner Reviews

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 19.91
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 40.76
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 224.29
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 20.02
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 2.12
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.70 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 2.72
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 937.94 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 19.88
Rig Dimensions
I (Foretriangle Height) 41.30 ft / 12.59 m
J (Foretriangle Base) 12.00 ft / 3.66 m
P (Mainsail Luff) 35.30 ft / 10.76 m
E (Mainsail Foot) 13.67 ft / 4.17 m
SA Fore 247.80 ft² / 23.02 m²
SA Main 241.28 ft² / 22.42 m²
SA Total (100%) 489.08 ft² / 45.44 m²
Est. Forestay Length 43.01 ft / 13.11 m
Engine & Accommodations
Engine Make Yanmar
Engine Model 2GM
Engine Type Diesel
Horsepower 15
Fuel Capacity 15 gals / 57 L
Water Capacity 15 gals / 57 L
How It Compares

vs. J30, S2 91 Se, Seidelmann 299

This boat Similar boats
Dimensions
LOA
S2 91 ★
29.8 ft
J30
29.8 ft
S2 91 Se
29.8 ft
Seidelmann 299
29.9 ft
LWL
S2 91 ★
25.0 ft
J30
25.0 ft
S2 91 Se
25.8 ft
Seidelmann 299
24.0 ft
Beam
S2 91 ★
10.5 ft
J30
11.2 ft
S2 91 Se
10.5 ft
Seidelmann 299
11.0 ft
Displacement
S2 91 ★
7 lbs
J30
7 lbs
S2 91 Se
7 lbs
Seidelmann 299
8 lbs
Ballast
S2 91 ★
3 lbs
J30
2 lbs
S2 91 Se
—
Seidelmann 299
3 lbs
Sail Area
S2 91 ★
490 sq ft
J30
444 sq ft
S2 91 Se
—
Seidelmann 299
429 sq ft
Performance
SA / Displacement (higher = more powerful)
S2 91 ★
19.9
J30
19.5
S2 91 Se
—
Seidelmann 299
17.2
Ballast / Disp (higher = stiffer)
S2 91 ★
40.8 %
J30
—
S2 91 Se
—
Seidelmann 299
45.0 %
Comfort Ratio (higher = more comfortable offshore)
S2 91 ★
20.0
J30
16.4
S2 91 Se
—
Seidelmann 299
19.7
Capsize Screening (lower = safer)
S2 91 ★
2.12
J30
2.34
S2 91 Se
—
Seidelmann 299
2.20
Displacement / Length (lower = lighter)
S2 91 ★
224
J30
—
S2 91 Se
196
Seidelmann 299
258
Hull Speed
S2 91 ★
6.7 kts
J30
6.7 kts
S2 91 Se
—
Seidelmann 299
6.6 kts
Speed Number (higher = faster)
S2 91 ★
2.7
J30
3.0
S2 91 Se
—
Seidelmann 299
2.1
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